I think the best solution is the
oil pump approach that fellow CC'er Bob Cowan posted:
Winter will be here soon - starting to think oil cooler thermostats again
See post 30 in this thread.
By using a pump from pan to cooler and back to the pan you don't get the pressure drop or have the problems with getting
oil up to temp as Rick Lake noted above.
I think this is a great solution that is on my to do list.
Matt